Other Filament Types
Microfilaments, microtubules, and intermediate filaments clearly are the major fibrous cytoplasmic components of eukaryotic cells, but the question remains whether any other filamentous structures have eluded identification. Such components could either be relatively minor constituents, or they might be ephemeral structures difficult to preserve and isolate. For example, the elaborate architecture of the microtrabecular lattice (see section VIII.) which is far more complex than the sum of the networks formed from the three major cytoskeletal filaments, has prompted the speculation that it contains and conceals additional cytoskeletal filaments. Is this speculation justified, and what is the evidence for the existence of other fibrous components with a cytoskeletal or motile function?
KeywordsFilament System Thin Filament Filament Type Cytoskeletal Filament Heavy Meromyosin
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